Variable condenser



April ,21, 1925. 1,534,213

G. HlLL VARIABLE coNDENsEn Filed'Fep; 5, 1925 2 Sheets-Sheet 2 PATENTrcsr-ics.

GUY HILL, or WASHINGTON, DISTRICT or COLUMBIA.

VARIABLE CONDENSER.

Application led February 43, 1923. Serial No.161(,759.

To all whom t may concern:

Be itv known that I, GUY HILL, la citizen of the United States, residingat Tashington, inthe District of Columbia, haveinvented certain new anduseful Improvements in Variable Condensers, of which the following is aspecification.

This invention relates to' an improved construction of a variablecondenser.

The main object of the invention is to construct a variable condenser inwhich the movable plates are held in fixed planes, keeping the verticaldistances between the fixed and movable plates invariable. This featureis of importance aad"value in variable condensers, making it vpossibleto maintain a fixed calibration of the condenser.

In the present method of condenser construction, the movable-plates aregenerally supported only at the center and it is very difficult tomaintain the movable plates in fixed planes with relation to the fixedplates, and this causes changes incapacity of the condenser. Also, ifthe separations between the fixed plates and the movable plates aresmall, the plates are apt to touch, causing a short circuit of thecendenser. vIn this invention a method for mountingthe movable plates isdescribed whereby these defects are eliminated. The method ofaccomplishing the result can be best understood by Ireference to theaccompanying drawings:

Figure 1 is an elevation view of the condenser. c

Figure 2 is a sectional view of the condenser through the line AAl ofFigure 1.

Figu 3 is a detailed drawing of a single movala e plate.

Figure 4 is a detailed gle fixed plate.`

Having particular; reference' to the drawings in .which like numeralsdesignate similar parts in Figure 1, 1 represents the fixed plates ofthe condenser; 2 designates the movable plates which are mounted on ashaft 41, which is inclosed in separators 4 and not specifically shownin Figure 1, but indicated in Figure 2. These movable plates 2 aresupported at the circumference by guide posts 7, these guide'postshaving suitable slots or recesses so that the movable plates can turnfreely through these slots and at the Sametime be maintained in adefinite lane with relation to the fixed plates. Tllie xed plates 1 are'supported .in posts 7.' 15 is a hole in the drawing of a sinon rods 10having suitable spacing elements 8 mounted on the rcds 10. Also spacingy elements 4 mounted on thc shaft 41' to keep the separation between themovable plates 2 and fixed plates l. Bis a suitable knob for rotatingthe plates.: It is understood, of course, that the separating elements 4on the sliaft-and the'separating elements 8 on the rods 10 are held ined position by any means adopted suitable for tha-t purpose,

and are also `supported at the extreme ends by the end plates tlapd 6. A.suitable 4 method described in detail for holding the spacingjelementsin proper position is given in my atent 1408738, issued March 7, 1922.

Figure 2: 7 shows sectional view ofthe rods lwhich support the movableplatea/also shows a sectional viewv of the rods 10 on which the fixed`plates are mounted.I

The forms of the plates are shownin Figures 3 and 4.

In Figure 3 a movable plate is shown which is formed vby taking a'circular disk of metal and cutting out a part of one half of its area,indicated by 13 in the diagram.

Thus the movable plate consists of a half circle indicated by 12 and theother half circle, having an annulus, indicated by 1,4. The object ofthis is so that the whole circumference of the plate at several pointscould be guided by revolvingin suitable slots plate 12 for mounting iton the shaft 41.

Figure '4 shows a detailed view of the fixed'plate, which is in tl eform of a semicircle with several gxtensions indicated by y16 formounting the plat? I claim:

V1. In a variable condense?, the combination of a plurality ofalternately arranged stationary andA movable plates, a central shaft,said movable plates having their` centers maintained a fixed distanceapart by suitable attachment to said central shaft-and having theirperipheries maintained the same fixed distance apart by peripheralsupporting elements, said movable plates being free from mechanicalcontact with said interleaving stationary plates, the dielectric betweensaid plates consisting entirely of air, said central shaft beingprovided with means for rotating said rncvabia plates:

2. In a variable condenser, the combination of a plurality of stationaryand movable plates alternately arranged with respect to each other, acentrally disposed shaft for rotating said movable plates, spacingmembers mounted on saidfshaft i'or centrally spacing said plates, eachof said movable plates @being circular and having a cut-out portionsubstantially coextensive with the main body portion of each of saidstationary plates, a plurality of peripheral spacing members to supportand. space the entire periphery of said movable plates, a plurality ofexterior spacingr members for said stationary plates.

3. ln a variable condenser, the combination of a plurality ot stationaryand mor able plates alternately arranged with respect to each other, aceiitrally disposed shaft for rotating said movable plates, spacingmembers vmounted on said shaft :for centrally spacing said plates, eachot said movable plates being circular and having a cut-out portionsubstantially coextensivc with the main body portion of each of saidstationary plates, a plurality ot' peripheral spacing members to supportand space the entire periphery of said movable plates, said stationaryplates having laterally extending projections, a plurality of exteriorspacing members adapted to receive said projections and space saidstationary plates.

4. In a variable condenser, the combination of a plurality of stationaryand movable plates alternately arranged with respect to each other, acentrally disposed shaft for rotating said movable plates, spacingmembers mounted on said shaft for centrally spacingA said plates, eachot said movable plates being circular and having a cut-out portionsubstantially coextensive with the main body portion of cach of saidstationary plates, a plurality of peripheral spacing members to supportand space the entire 1; eriphery of said movable plates, a plurality ofexterior spacing members for said sta tionary plates, the air spacebetween said plates forming the dielectric and constituting the onlyinsulation intermediate or" said plates.

In testimony whereof t aiiix my signature.

GUY HILL.

